I purchased this Pavilion X360 touch screen convertible PC with the idea that I could continue hand sketching on screen as I did on my Samsung Galaxy 10.1 tablet. However, I am having difficulty finding a compatible stylus/pen. The computer is pre-loaded with Autodesk Auto Sketch demo which needs a fine point stylus or pen for best results. Is there a compatible stylus that I can purchase. There are plenty of reports to the effect that one does not exist. Can you please help?